Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95126daaed55072…

MALICIOUS

PDF

72.3 KB Created: 2021-10-03 17:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 94fb976d621f52d3f86828dbad717d09 SHA-1: d3897f96f21be5796763221c80206f488b8f5405 SHA-256: e95126daaed5507205cc5d269afece52fd82414c25dec3d195e2e9442fa6b404
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cmfnepal.org/userfiles/files/beviwovenogadijasuteker.pdf In PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/81039294120.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/nilijigisusirupi.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/kagusigivojefetefiju.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/49091670713.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/84689760429.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/65869538956.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/xisus.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/90946031516.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/24623968253.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161505d5723f50---59595799464.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161500ceead9de---34529487884.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/vuxixalipimefetujorasowop.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/6701685861.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/36613917656.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/raxuwesikil.pdfIn PDF document text
    • https://macronew.com/upload/files/toledusileral.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/revekalukavevupo.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/9590791670.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161564d69372a0---74191382275.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/53291357876.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/tusidezuzidewutitagul.pdfIn PDF document text
    • http://prota.ru/upload/files/kolotabawikor.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210921_E243D37B708656B9.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30795714552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=worksheet+for+healthy+and+unhealthy+foodPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F5 10656 bytes
SHA-256: 5107cb0e728f7dfd4dc4916abfef1f3b67112cc6581aa43525c6e745cc97eab1
font_01_sfnt_off0000cc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 18064 bytes
SHA-256: 804b5c98419cc09427845ef8a9a6f0803999646d76213a99609437f936bb6473